L Carnitine is Underrated. New Meta Review Reminds Us Why. Acylcarnitine: Structure, Metabolism, Functions, and Advanced Analysis Techniques MetwareBio Comparison of short term and long term effects of peroral L carnitine intake: clinical implications of elevated TMAO levels in cardiovascular complications L Carnitine has become one of the most commonly asked about supplements over the past 18 months and I can see why when looking at all the research that has come out about it over the last 2ish years.,